66349937 has 2 divisors, whose sum is σ = 66349938. Its totient is φ = 66349936.

The previous prime is 66349909. The next prime is 66349939. The reversal of 66349937 is 73994366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60855601 + 5494336 = 7801^2 + 2344^2 .

It is a cyclic number.

It is not a de Polignac number, because 66349937 - 2⁶ = 66349873 is a prime.

Together with 66349939, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66349891 and 66349900.

It is not a weakly prime, because it can be changed into another prime (66349939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33174968 + 33174969.

It is an arithmetic number, because the mean of its divisors is an integer number (33174969).

Almost surely, 2^66349937 is an apocalyptic number.

It is an amenable number.

66349937 is a deficient number, since it is larger than the sum of its proper divisors (1).

66349937 is an equidigital number, since it uses as much as digits as its factorization.

66349937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 47.

The square root of 66349937 is about 8145.5470657286. The cubic root of 66349937 is about 404.8369754881.

The spelling of 66349937 in words is "sixty-six million, three hundred forty-nine thousand, nine hundred thirty-seven".